What are the sierra madre occidental oriental and del sur?

The Sierra Madre Occidental is a mountain range in western Mexico. It stretches from the state of Sonora in the north to the state of Nayarit in the south. It is the longest mountain range in Mexico, with a length of about 1,500 kilometres (932 mi). The range forms a barrier between the Pacific Ocean and the central plateau of Mexico. The average altitude of the range is about 2,000 meters (6,600 ft), with some peaks reaching over 3,000 meters (9,800 ft). The range is heavily forested and is home to a variety of plant and animal life, including several endemic species.

Sierra Madre Oriental

The Sierra Madre Oriental is a mountain range in eastern Mexico. It stretches from the state of Tamaulipas in the north to the state of Veracruz in the south. It is the second longest mountain range in Mexico, with a length of about 1,300 kilometres (810 mi). The range forms a barrier between the Gulf of Mexico and the central plateau of Mexico. The average altitude of the range is about 1,500 meters (4,900 ft), with some peaks reaching over 3,000 meters (9,800 ft). The range is heavily forested and is home to a variety of plant and animal life, including several endemic species.

Sierra Madre del Sur

The Sierra Madre del Sur is a mountain range in southern Mexico. It stretches from the state of Oaxaca in the west to the state of Chiapas in the east. It is the third longest mountain range in Mexico, with a length of about 900 kilometres (560 mi). The range forms a barrier between the Pacific Ocean and the central plateau of Mexico. The average altitude of the range is about 1,000 meters (3,300 ft), with some peaks reaching over 3,000 meters (9,800 ft). The range is heavily forested and is home to a variety of plant and animal life, including several endemic species.